<!-- 上拉触底和下拉刷新两件事不知道为什么实现不了，代码已经给到位了 
  解决了：解决方法是onReachBottom和onPullDownRefresh与methods是同级才能触发-->
<template>
  <view>
    <view class="goods-list">
      <view v-for="(goods,i) in goodsList" :key="i" @click="gotoDetail(goods)">
        <my-goods :goods="goods"></my-goods>
      </view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        // 请求参数对象
        queryObj:{
          query:'',
          cid:'',
          pagenum:1,
          pagesize:10
        },
        goodsList:[],
        total:0,
        // 节流阀
        isloading:false
      };
    },
    onLoad(options) {
      this.queryObj.query = options.query || ''
      this.queryObj.cid = options.cid || ''
      
      this.getGoodsList()
    },
    methods:{
      //获取商品列表数据的方法
      async getGoodsList(cb){
        // 打开节流阀
        this.isloading = true
       const {data:res} = await uni.$http.get('/api/public/v1/goods/search',this.queryObj)
       // 关闭节流阀
       this.isloading = false
       cb && cb()
       
        //请求失败
        if(res.meta.status !== 200){
        return  uni.showToast({
           title:'数据请求失败！',
           duration:1500,
           icon: 'none'
         })
        }
        
        // 它的作用是将 res.message.goods 数组中的元素追加到 this.goodsList 数组中，同时保持 this.goodsList 的原有内容不变。
        this.goodsList = [...this.goodsList,...res.message.goods]
        this.total = res.message.total
      },
      gotoDetail(goods){
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?goods_id=' + goods.goods_id
        })
      }
    },
    onReachBottom(){
      // 判断是否还有下一页数据
      if(this.queryObj.pagenum*this.queryObj.pagesize>=this.total)
       return  uni.showToast({
         title:'数据加载完毕！',
         duration:1500,
         icon: 'none'
       }) 
      
      if(this.isloading) return
      
      // 让页码值自增+1
      this.queryObj.pagenum++
      this.getGoodsList()
    },
    onPullDownRefresh(){
      //重置关键数据
      this.queryObj.pagenum = 1
      this.total = 0
      this.isloading = false
      this.goodsList = []
      
      //重新发起数据请求
      this.getGoodsList(() => uni.stopPullDownRefresh())
    }
  }
</script>

<style lang="scss">

</style>
